1. The document discusses how knowledge graphs and social graphs represent connections between data elements by understanding their properties and relationships. It provides examples of how Google is using knowledge graphs and social graphs to power semantic search and enhance search results. 2. The presentation recommends ways for marketers to take advantage of knowledge graphs and social graphs, such as using schema markup, Google+ verification for businesses, engaging with related profiles, and posting relevant content. 3. Integrating knowledge graphs and social graphs allows Google to provide answers to complex questions, amplify word-of-mouth recommendations, and deliver more personalized local search results to users.